Wide Range Variable Voltage Transformerless DC Power Supply Using TRIAC

Augustinus Sujono (Departement of Electrical Engineering, Faculty of Engineering, Universitas Sebelas Maret)
Feri Adriyanto (Departement of Electrical Engineering, Faculty of Engineering, Universitas Sebelas Maret)
Hari Maghfiroh (Departement of Electrical Engineering, Faculty of Engineering, Universitas Sebelas Maret)
Joko Slamet Saputro (Departement of Electrical Engineering, Faculty of Engineering, Universitas Sebelas Maret)
Agus Ramelan (Departement of Electrical Engineering, Faculty of Engineering, Universitas Sebelas Maret)

Journal of Electrical, Electronic, Information, and Communication Technology (JEEICT)
Vol 2, No 2 (2020): JOURNAL OF ELECTRICAL, ELECTRONIC, INFORMATION, AND COMMUNICATION TECHNOLOGY

Variable voltage DC power supply that has wide range of power, lightweight and inexpensive is quite difficult to obtain. This research designs and tests a DC power supply without a transformer using switching technology that utilizes TRIAC. The 220 Volt AC power source is converted to DC electricity by the method of cutting off some AC waves signal, using TRIAC, and then rectifying it with diodes and filters. DIAC functions as a trigger TRIAC at the specified time, by turning the variable resistor. The test results show that the output DC power voltage can be adjusted from 5 Volts to 75 Volts by adjusting the DIAC resistance and the load resistance. The results of the series image characteristics are given 2-dimensional and 3-dimensional graphics.